7 files declare their use of ModuleHandler

AccountSettingsForm.php in drupal/core/modules/user/lib/Drupal/user/AccountSettingsForm.php: Contains \Drupal\user\AccountSettingsForm.
CustomBlockController.php in drupal/core/modules/block/custom_block/lib/Drupal/custom_block/Controller/CustomBlockController.php: Contains \Drupal\custom_block\Controller\CustomBlockController
FieldInstanceStorageController.php in drupal/core/modules/field/lib/Drupal/field/FieldInstanceStorageController.php: Contains \Drupal\field\FieldInstanceStorageController.
FieldStorageController.php in drupal/core/modules/field/lib/Drupal/field/FieldStorageController.php: Contains \Drupal\field\FieldStorageController.
ModuleHandlerUnitTest.php in drupal/core/tests/Drupal/Tests/Core/Extension/ModuleHandlerUnitTest.php: Contains \Drupal\Core\Extension\ModuleHanderUnitTest.
SearchSettingsForm.php in drupal/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php: Contains \Drupal\search\Form\SearchSettingsForm.
StatisticsSettingsForm.php in drupal/core/modules/statistics/lib/Drupal/statistics/StatisticsSettingsForm.php: Contains \Drupal\statistics\StatisticsSettingsForm.